Method and apparatus for recording and reproducing video and sound
First Claim
1. Apparatus for recording or reproducing video signals onto or from a recording disc, said apparatus comprising:
- a recording disc;
means for rotating said recording disc at a constant rate about a center of rotation;
a first transducer for recording or reproducing video signals onto or from a selected portion of said recording disc, said first transducer being of the magnetic type and having a substantially straight recording gap for recording or reading imprints representing said video signals in a succession of tracks about the center of rotation, the imprints of the video signals for a given picture element being merged from track to track to form a continuous line intersecting different radii of the disc at substantially equal angles;
said first transducer being mounted on a pivoted lever, the gap of said first transducer being disposed substantially at right angles to said lever and tangent to the line to which it is adjacent, the pivot point of said lever being displaced from said center of rotation and being selected so that motion of said lever about its pivot point will cause said gap to move along the lines of imprints; and
means for swinging said lever while said disc is being rotated.
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Accused Products
Abstract
Apparatus in which a recording transducer is moved along a rotating record medium to develop a series of imprints which are phase-synchronized from track to track. The adjacent tracks are merged with the result that the imprints form a slanted pattern of generally continuous lines extending at an angle to the record tracks.
More than one recording can coexist in the same medium surface by means of utilizing a plurality of such slanted patterns, each of a different slant. For multiple recordings, either a plurality of transducers are used to record and playback, or a single transducer can be used by rotating it to the appropriate orientation.
Sound is recorded in the sync. intervals in the form of samples which form a staggered pattern of their own from track to track, so that only one sound sample may be read out at a time, even when the tracks have been heavily overlapped. Since the sound samples utilize a much smaller portion of the medium surface than the video, there is room in the sync. interval for more than one sound sample. A dither modulation is used to record and read out a higher sound fidelity or a stereophonic rendition or, in general, a multiplicity of sound channels accompanying the video.
Both a damping and also a stiffening method are used to make existing magnetic transducers extremely accurate in the location of the imprints during recording and reading, permitting the omission of clock transitions during recording, which is equivalent of a single side band process for maximum efficiency in medium utilization.
37 Citations
54 Claims
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1. Apparatus for recording or reproducing video signals onto or from a recording disc, said apparatus comprising:
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a recording disc; means for rotating said recording disc at a constant rate about a center of rotation; a first transducer for recording or reproducing video signals onto or from a selected portion of said recording disc, said first transducer being of the magnetic type and having a substantially straight recording gap for recording or reading imprints representing said video signals in a succession of tracks about the center of rotation, the imprints of the video signals for a given picture element being merged from track to track to form a continuous line intersecting different radii of the disc at substantially equal angles; said first transducer being mounted on a pivoted lever, the gap of said first transducer being disposed substantially at right angles to said lever and tangent to the line to which it is adjacent, the pivot point of said lever being displaced from said center of rotation and being selected so that motion of said lever about its pivot point will cause said gap to move along the lines of imprints; and means for swinging said lever while said disc is being rotated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The method of recording video signals on a selected portion of a recording medium by means of a transducer having a recording gap, said method comprising the steps of:
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providing relative rotation between the transducer and the recording medium about a center of rotation; causing the transducer to describe a predetermined curve upon the recording medium during relative motion thereof to define a first transducer progress path approximating a logarithmic spiral within the selected portion, the curve intersecting different radii within the selected portion at substantially equal angles and having a center of curvature at a point different from the center of rotation; and orienting the gap of the transducer at a selected angle with respect to the curve of the transducer progress path. - View Dependent Claims (13, 14, 15)
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16. Apparatus for reading or recording an image represented by video signals on a portion of a recording surface, the video image being made up of frames, each frame being formed of scan lines separated by sync intervals, said apparatus comprising:
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a transducer mounted adjacent the recording surface; means for introducing relative rotation between the transducer and the recording surface about a center of rotation; means for introducing additional relative movement between the transducer and the recording surface such that the transducer relative to the recording surface traverses a continuous transducer progress path approximating a logarithmic spiral within said portion with the transducer aligned to intersect different radii of the center of rotation at substantially equal angles; a display device; and means for coupling said transducer to said display device to present on said display device the video image recorded on the recording surface. - View Dependent Claims (17)
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18. Apparatus for recording or reproducing video signals onto or from a recording disc, said apparatus comprising:
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a recording disc; means for rotating said recording disc about a center of rotation; a transducer for recording or reproducing video signals onto or from said recording disc, said transducer being of the magnetic type and having a recording gap; said transducer being mounted on a pivoted lever, the gap of said transducer being disposed substantially at right angles to said lever, the pivot point of said lever being displaced from said center of rotation and being selected so that motion of said lever about its pivot point will cause said gap to move along a curve approximating a logarithmic spiral in the record portion of the disc, the curve intersecting different radii in the record portion at substantially equal angles; means for swinging said lever while said disc is being rotated; a television camera; a television picture reproducing device; and means for selectively coupling said transducer either to said camera or to said reproducing device for either recording on said disc or reproducing from said disc a time changing picture.
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19. Apparatus for reproducing and displaying previously recorded video signals from a recording disc, said apparatus comprising;
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a recording disc; means for rotating said recording disc about a center of rotation; a transducer for reproducing video signals from said recording disc, said transducer being of the magnetic type and having a recording gap; said transducer being mounted on a pivoted lever, the gap of said transducer being disposed substantially at right angles to said lever, the pivot point of said lever being displaced from said center of rotation and being selected so that motion of said lever about its pivot point will cause said gap to follow a progress path approximating a logarithmic spiral within a selected record portion of the disc, said progress path intersecting different radii of the recording disc center of rotation at substantially equal angles; means for swinging said lever while said disc is being rotated; a video signal display device; and means for coupling said transducer to said display device to display the video signals recorded on said recording disc. - View Dependent Claims (20)
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21. A method of recording a time changing picture on a rotating surface having a center of rotation wherein the picture is formed of frames and each frame is formed of scan lines, the method comprising the steps of:
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breaking each scan line into a number of picture elements at intervals along such scan line, each picture element having a fixed display position from frame to frame; and recording in coaxial paths on the recording surface an imprint for each picture element such that the imprints from coaxial path to path for the picture elements having the same display position from frame to frame are located along a continuous transducer progress path with adjacent imprints for a given display position being merged together and intersecting different radii of the center of rotation at substantial angles thereto throughout the extent of the progress path. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of recording first and second time changing pictures on a rotating magnetic surface having a center of rotation wherein each picture is formed of frames and each frame is formed of scan lines, the method comprising the steps of:
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breaking each scan line of the first picture into a number of picture elements at intervals along such scan line, each picture element having a fixed display position from frame to frame; recording in coaxial paths on the recording surface one discrete, magnetizing imprint for each picture element of the first picture such that the imprints from coaxial path to path for the picture elements of the first picture having the same display position from frame to frame are located along a continuous transducer progress path with adjacent imprints for a given display position being merged together and intersecting different radii of the center of rotation at a substantially constant angle; breaking each scan line of the second picture into a number of picture elements at intervals along such scan line, each picture element having a fixed display position from frame to frame; and recording in coaxial paths on the same area of the recording surface as the first picture one discrete magnetizing imprint for each picture element of the second picture such that the imprints from coaxial path to path for the picture elements of the second picture having the same display position from frame to frame are located along a continuous transducer progress path with adjacent imprints for a given display position being merged together and intersecting different radii of the center of rotation at a second substantially constant angle which differs from the first-mentioned angle such that the imprints for the picture elements of the second picture are oriented differently from the imprints for the picture elements of the first picture. - View Dependent Claims (33, 34, 35, 36, 37)
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38. Apparatus for reading or recording a changing, i.e., video picture, on a recording surface wherein the picture is formed of frames and each frame is formed of scan lines containing a number of picture elements and wherein the record of the video picture is a plurality of continuous lines, each comprising a plurality of merged imprints representing a corresponding picture element, the apparatus comprising:
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a transducer mounted adjacent the recording surface; means for introducing relative rotation between the transducer and the recording surface about a center of rotation traversing a succession of tracks corresponding to successive frames of the picture; and means for introducing relative movement between the transducer and the recording surface such that the transducer relative to the recording surface traverses a continuous transducer progress path aligned with the continuous lines and intersecting different radii of the center of rotation at substantially equal angles. - View Dependent Claims (39, 40)
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41. Apparatus for recording or reproducing video signals onto or from a recording disc, said apparatus comprising:
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a recording disc; means for rotating said recording disc at a constant rate about a center of rotation; a first transducer for recording or reproducing first video signals onto or from a selected portion of said recording disc, said first transducer being of the magnetic type and having a substantially straight recording gap for recording or reading imprints representing said first video signals in a succession of tracks about the center of rotation, the imprints of the first video signals for a given picture element being merged from track to track to form a continuous line intersecting different radii of the disc; means for moving said first transducer relative to the center of rotation along a progress path which is always slanted relative to the intersected radii of the disc; a second transducer for recording or reproducing second video signals onto or from said selected portion, said second transducer being of the magnetic type and having a substantially straight recording gap for recording or reading imprints representing said second video signals in a succession of tracks about the center of rotation, the imprints of the second video signals for a given second picture element being merged from track to track to form a second continuous line at a substantial angle to a corresponding line of the first transducer; and means for moving said second transducer along a second progress path to develop said second lines. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. Apparatus for recording a time changing picture on a record medium wherein the picture is formed of frames and each frame is formed of scan lines, the apparatus comprising:
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a magnetic transducer; means coupled to the transducer for applying video signals to be recorded on the record medium; means for supporting the record medium adjacent the transducer; means for developing relative rotation between the transducer and the record medium about a center of rotation; means for energizing the transducer to record a series of imprints corresponding to the applied video signals in successive concentric tracks on the record medium; means for developing relative movement between the transducer and the record medium such that the imprints from track to track are merged to form a pattern of continuous straight lines corresponding respectively to picture elements having a fixed display position from frame to frame, the lines forming a substantial angle to the direction of the tracks and intersecting different radii of the center of rotation. - View Dependent Claims (49, 50, 51, 52, 53, 54)
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Specification